diff --git a/src/util/bdnet.cc b/src/util/bdnet.cc
index 1733ca5..18413da 100644
--- a/src/util/bdnet.cc
+++ b/src/util/bdnet.cc
@@ -273,12 +273,12 @@ int bdnet_inet_aton(const char *name, struct in_addr *addr)
 
 
 
-void sleep(int sec) 
+int sleep(unsigned int sec)
 { 
 	Sleep(sec * 1000); 
 }
 
-void usleep(int usec) 
+int usleep(unsigned int usec)
 { 
 	Sleep(usec / 1000); 
 }
diff --git a/src/util/bdnet.h b/src/util/bdnet.h
index 2d4ac37..6849003 100644
--- a/src/util/bdnet.h
+++ b/src/util/bdnet.h
@@ -157,8 +157,8 @@ int     bdnet_w2u_errno(int error);
  * ms uses millisecs.
  * void Sleep(int ms);
  */
-void sleep(int sec); 
-void usleep(int usec);
+int sleep(unsigned int sec);
+int usleep(unsigned int usec);
 
 #endif // END of WINDOWS defines.
 /********************************** WINDOWS/UNIX SPECIFIC PART ******************/